[jira] [Created] (LOG4J2-3535) Certain strings passed into StrSubstitutor can cause "infinite loop in property interpolation"

["Pascal Koeiman (Jira)" <ji...@apache.org>]

Pascal Koeiman created LOG4J2-3535:
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             Summary: Certain strings passed into StrSubstitutor can cause "infinite loop in property interpolation"
                 Key: LOG4J2-3535
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3535
             Project: Log4j 2
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.17.2
            Reporter: Pascal Koeiman
         Attachments: Crash_e4372c5ba2ed2cdbd5d87cfd541a5bcae60fb274.java, crash-e4372c5ba2ed2cdbd5d87cfd541a5bcae60fb274, hhsJazzer.jar

I believe this is a similar issue to what's listed here, although there it is deemed fixed in 2.17.0: https://issues.apache.org/jira/browse/LOG4J2-3230

Using Code Intelligence's fuzz testing tool ([Jazzer|https://github.com/CodeIntelligenceTesting/jazzer]), the exception was found by having the tool pass in generated strings to the *replace* method of the *StrSubstitutor* class. See also the message below:

{{== Java Exception: java.lang.IllegalStateException: Infinite loop in property interpolation of ${k:-$}ߤ\{${$k:-${$k}߀��$}����:$����$}����-: $k
        at org.apache.logging.log4j.core.lookup.StrSubstitutor.checkCyclicSubstitution(StrSubstitutor.java:1087)
        at org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1034)
        at org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1047)
        at org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:912)
        at org.apache.logging.log4j.core.lookup.StrSubstitutor.replace(StrSubstitutor.java:467)
        at org.apache.logging.log4j.core.lookup.StrSubstitutor.replace(StrSubstitutor.java:451)
        at Log4jFuzzer.fuzzerTestOneInput(Log4jFuzzer.java:16)}}



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